RDFS closure tool

Hi,

Is there anybody knows a RDFS closure tool that generates
a closure set given a RDFS triples set.?

I think the tool is especially useful in experimenting with
the RDFS Semantics. It will be better if the tool accepts N3
since N3 is much easier to scribble.

TIA.

-- 
Lei Zhang, http://apex.sjtu.edu.cn/people/zhanglei/
Chairman of the Self-Organized Board